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btrfs: add assertion helpers for extent buffer read lock counters 

The read_locks are a simple counter to track locking balance and used to
assert tree locks.  Add helpers to make it conditionally work only in
DEBUG builds.  Will be used in followup patches.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2018-08-24 16:13:41 +02:00
parent afd495a826
commit 58a2ddaedb
1 changed files with 18 additions and 7 deletions
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25
fs/btrfs/locking.c
View File

@ -12,8 +12,6 @@
#include "extent_io.h" #include "extent_io.h"
#include "locking.h" #include "locking.h"
static void btrfs_assert_tree_read_locked(struct extent_buffer *eb);
#ifdef CONFIG_BTRFS_DEBUG #ifdef CONFIG_BTRFS_DEBUG
static void btrfs_assert_spinning_writers_get(struct extent_buffer *eb) static void btrfs_assert_spinning_writers_get(struct extent_buffer *eb)
{ {
@ -43,12 +41,30 @@ static void btrfs_assert_spinning_readers_put(struct extent_buffer *eb)
atomic_dec(&eb->spinning_readers); atomic_dec(&eb->spinning_readers);
} }
static void btrfs_assert_tree_read_locks_get(struct extent_buffer *eb)
{
atomic_inc(&eb->read_locks);
}
static void btrfs_assert_tree_read_locks_put(struct extent_buffer *eb)
{
atomic_dec(&eb->read_locks);
}
static void btrfs_assert_tree_read_locked(struct extent_buffer *eb)
{
BUG_ON(!atomic_read(&eb->read_locks));
}
#else #else
static void btrfs_assert_spinning_writers_get(struct extent_buffer *eb) { } static void btrfs_assert_spinning_writers_get(struct extent_buffer *eb) { }
static void btrfs_assert_spinning_writers_put(struct extent_buffer *eb) { } static void btrfs_assert_spinning_writers_put(struct extent_buffer *eb) { }
static void btrfs_assert_no_spinning_writers(struct extent_buffer *eb) { } static void btrfs_assert_no_spinning_writers(struct extent_buffer *eb) { }
static void btrfs_assert_spinning_readers_put(struct extent_buffer *eb) { } static void btrfs_assert_spinning_readers_put(struct extent_buffer *eb) { }
static void btrfs_assert_spinning_readers_get(struct extent_buffer *eb) { } static void btrfs_assert_spinning_readers_get(struct extent_buffer *eb) { }
static void btrfs_assert_tree_read_locked(struct extent_buffer *eb) { }
static void btrfs_assert_tree_read_locks_get(struct extent_buffer *eb) { }
static void btrfs_assert_tree_read_locks_put(struct extent_buffer *eb) { }
#endif #endif
void btrfs_set_lock_blocking_read(struct extent_buffer *eb) void btrfs_set_lock_blocking_read(struct extent_buffer *eb)
@ -309,8 +325,3 @@ void btrfs_assert_tree_locked(struct extent_buffer *eb)
{ {
BUG_ON(!atomic_read(&eb->write_locks)); BUG_ON(!atomic_read(&eb->write_locks));
} }
static void btrfs_assert_tree_read_locked(struct extent_buffer *eb)
{
BUG_ON(!atomic_read(&eb->read_locks));
}